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feat: df.to_pandas_batches() returns one empty DataFrame if df is empty #1878

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feat: df.to_pandas_batches() returns one empty DataFrame if df is empty #1878

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@tswast tswast commented Jul 1, 2025

Thank you for opening a Pull Request! Before submitting your PR, there are a few things you can do to make sure it goes smoothly:

  • Make sure to open an issue as a bug/issue before writing your code! That way we can discuss the change, evaluate designs, and agree on the general idea
  • Ensure the tests and linter pass
  • Code coverage does not decrease (if any source code was changed)
  • Appropriate docs were updated (if necessary)

Fixes internal issue b/428918844
Towards internal issue b/428700094
Related to #1841 (comment)
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@tswast tswast requested review from a team as code owners July 1, 2025 19:07
@tswast tswast requested a review from GarrettWu July 1, 2025 19:07
@product-auto-label product-auto-label bot added the size: s Pull request size is small. label Jul 1, 2025
@product-auto-label product-auto-label bot added the api: bigquery Issues related to the googleapis/python-bigquery-dataframes API. label Jul 1, 2025
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tswast commented Jul 1, 2025

e2e failures:

=========================== short test summary info ============================
FAILED tests/system/large/streaming/test_bigtable.py::test_streaming_df_to_bigtable
= 1 failed, 373 passed, 6 skipped, 6 xfailed, 6 xpassed, 238 warnings, 2 retried in 1490.68s (0:24:50) =

notebook failures:

------------------------------ Captured log call -------------------------------
ERROR    traitlets:client.py:568 Error occurred while starting new kernel client for kernel 6b697f25-7265-4473-944b-615ef14436e9: Kernel didn't respond in 60 seconds

Learn more about nbmake at [https://github.com/treebeardtech/nbmake](https://www.google.com/url?q=https://github.com/treebeardtech/nbmake&sa=D)

============================== slowest durations ===============================
61.19s call     notebooks/geo/geoseries.ipynb::geoseries.ipynb

(2 durations < 0.005s hidden.  Use -vv to show these durations.)
=========================== short test summary info ============================
FAILED notebooks/geo/geoseries.ipynb::geoseries.ipynb - NBMAKE INTERNAL ERROR
========================= 1 failed in 61.31s (0:01:01) =========================
Exception ignored in atexit callback: <bound method run_sync.<locals>.wrapped of <nbcl

Samples failures:

=========================== short test summary info ============================
FAILED classification_boosted_tree_model_test.py::test_boosted_tree_model - g...
============ 1 failed, 27 passed, 42 warnings in 2989.94s (0:49:49) ============

None of these appear to be related to the changes I've made in this PR.

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@GarrettWu GarrettWu Awaiting requested review from GarrettWu GarrettWu is a code owner automatically assigned from googleapis/api-bigquery-dataframe

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